| Financial Data 
 SUMMARY CONSOLIDATED FINANCIAL INFORMATION
 
 YEAR ENDED DECEMBER 31,
 ----------------------------------------
 1997          1998           1999
 -----------   -----------   ------------
 STATEMENT OF OPERATIONS DATA:
 Revenues..............................................  $        --   $        --   $    649,393
 Cost of revenues......................................           --            --      2,925,012
 -----------   -----------   ------------
 Gross profit (loss)...................................           --            --     (2,275,619)
 Development expenses..................................      243,295       253,898      1,481,357
 Sales and marketing expenses..........................      327,881       531,235      1,264,133
 General and administrative expenses...................      970,153     1,476,877      5,159,580
 Non-cash compensation and consulting services.........       20,751        40,384      1,794,270
 Depreciation and amortization.........................           --        36,996        279,794
 -----------   -----------   ------------
 Loss from operations..................................   (1,562,080)   (2,339,390)   (12,254,753)
 Interest and other income (expense), net..............       (3,094)     (121,771)        49,994
 -----------   -----------   ------------
 Net loss (1)..........................................  $(1,565,174)  $(2,461,161)  $(12,204,759)
 ===========   ===========   ============
 Net loss attributable to common stockholders (1)......  $(1,565,174)  $(2,461,161)  $(12,848,801)
 ===========   ===========   ============
 Basic and diluted net loss per share (1)..............  $     (0.42)  $     (0.66)  $      (2.37)
 ===========   ===========   ============
 Weighted average common shares outstanding, basic
 and diluted.........................................    3,725,400     3,725,400      5,422,278
 Pro forma basic and diluted net loss per share (1)....
 Pro forma weighted average common shares
 outstanding, basic and diluted......................
 
 ------------------------
 
 (1) Does not include income (loss) of ($221,352), $2,061,330 and ($2,699,086) in
 1997, 1998 and 1999, respectively, related to discontinued operations.
 
 DECEMBER 31, 1999
 ---------------------------------------
 PRO FORMA
 ACTUAL       PRO FORMA    AS ADJUSTED
 -----------   -----------   -----------
 BALANCE SHEET DATA:
 Cash and cash equivalents.........................  $25,768,227   $51,398,763     $
 Working capital...................................   19,678,842    45,309,378
 Total assets......................................   31,095,845    56,726,381
 Capital lease obligations, less current portion...      813,232       813,232
 Series A-1 convertible preferred
 stock--redeemable...............................    6,150,810            --
 Series B cumulative redeemable
 senior preferred stock..........................   15,182,365            --
 Series C cumulative convertible senior
 preferred stock--redeemable.....................   15,182,366            --
 Series D convertible preferred stock..............           --
 Total common stockholders' equity (deficiency)....  (13,654,166)   48,491,911
 
 The pro forma financial information gives effect to:
 
 - the private placement of 2,120,228 shares of our Series D preferred stock
 on March 7, 2000 for proceeds of approximately $41.0 million;
 
 - the redemption of all 11,980,561 shares of our Series B preferred stock
 for approximately $15.5 million upon the closing of this offering; and
 
 - the conversion of all of our Series A-1, C and D preferred stock into an
 aggregate of 19,225,775 shares of our common stock upon the closing of
 this offering (excluding the conversion of accrued preferred dividends).
 
 The pro forma as adjusted financial information gives effect to our sale of
 shares of our common stock in this offering at an assumed initial public
 offering price of $      per share and our receipt of the net proceeds of that
 sale, after deducting our estimated offering expenses, including underwriting
 discounts and commissions.
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